I get details can be blurry on a bad lens but how is this like pixel resolution?
CCTV lenses are often 1-5 megapixel lenses. How can a lens have a mega pixel count?
What does it mean for a lens to “resolve” more detail? Is this just about sharpness?
Also when buying DSLR lenses how can you tell what their resolution will be?
Thanks 🙂
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The term you want to look for in the lenses is “circle of confusion”. This is the smallest point of light that the lens can produce. If the size of the pixel in the sensor should ideally match the circle of confusion of the lens.
Having said that, the glass is very durable, whereas the sensors come and go every few years. So when I was buying gear I spent more on good lenses and then getting better sensors as the sensors got better and cheaper. I ended up spending a lot, but only once, on lenses. Then I started with the camera body that I could afford, and got a new body when the old body wouldn’t do what I wanted.
https://en.wikipedia.org/wiki/Circle_of_confusion?wprov=sfti1
MTF charts for lenses are also worth understanding, and not too much work to get your head around.
https://photographylife.com/how-to-read-mtf-charts
This will let you get started with your search and help in making to choices beyond subjective thoughts in review articles.
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